Home / 15,515.70-21,412.20-8,442.39

Finding the Fourth Proportional to 15,515.70, 21,412.20 and 8,442.39

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Solution

The fourth proportional to 15,515.70, 21,412.20 and 8,442.39 is: 11,650.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,515.70 : 21,412.20 = 8,442.39 : x
  2. Step 2: Convert to fraction form
    15,515.70/21,412.20 = 8,442.39/x
  3. Step 3: Cross multiply
    15,515.70x = 21,412.20 × 8,442.39
  4. Step 4: Simplify right side
    15,515.70x = 180,769,993.89
  5. Step 5: Solve for x
    x = 180,769,993.89/15,515.70
  6. Step 6: Final answer
    x = 11,650.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.